The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
I have collected this species in Montana but it is very common in Alaska streams.
This mayfly was collected from the Kwethluk River in Alaska on June 19th, 2010 and added to Troutnut.com by Bnewell on June 26th, 2011.